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Related Experiment Videos

Needle-type lactate biosensor.

Q Yang1, P Atanasov, E Wilkins

  • 1Chemical and Nuclear Engineering Department, University of New Mexico, Albuquerque 87131, USA.

Biosensors & Bioelectronics
|April 2, 1999
PubMed
Summary
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A new needle-type biosensor enables continuous intravascular lactate monitoring. This stable sensor accurately measures lactate levels in blood for extended periods.

Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Biosensors

Background:

  • Continuous lactate monitoring is crucial for managing critically ill patients.
  • Existing methods for lactate measurement have limitations in real-time clinical application.

Purpose of the Study:

  • To develop and evaluate a novel needle-type lactate biosensor for continuous intravascular monitoring.
  • To ensure sensor stability, accuracy, and minimal interference in physiological conditions.

Main Methods:

  • Fabrication of a needle-type biosensor using poly(1,3-phenylenediamine) and immobilized lactate oxidase.
  • Enzyme stabilization with dithiothreitol and diffusion control with polyvinyl chloride (PVC) membrane.
  • In vitro and blood plasma evaluations of sensor sensitivity, linearity, and response time.

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Main Results:

  • The biosensor demonstrated a sensitivity of 10-15 nA/mM with a linear range of 1-15 mM lactate.
  • Similar performance was observed in buffer and blood plasma, with a rapid response time of ~1 minute.
  • Continuous operation for 7 days and storage for 9 months showed minimal changes in sensor performance.

Conclusions:

  • The developed needle-type lactate biosensor is suitable for continuous intravascular monitoring.
  • The sensor exhibits excellent stability, accuracy, and long-term performance in physiological environments.
  • This technology offers a promising tool for real-time lactate assessment in clinical settings.